Sometimes, it doesn't matter how many quality ingredients you chuck into a recipe; if something happens to go wrong during the cooking, it can all turn out like mush. The same is true of any video game. Reading the back-of-the-box-blurb will often promise you all sorts of magical features, but they rarely give any clue as to how they're implemented. And implementation is always the key.
The Mummy: Tomb of the Dragon Emperor has guns, bombs, magic and myth, pitfalls filled with spikes, death drops and a whole host of burly men who clearly spend too much time down the gym. It's also been handled by a developer that knows a thing or two about your average action adventure title, but ultimately, all these classic elements are never strung together convincingly enough to create anything beyond a mediocre and slightly disjointed experience. If Pocket Gamer were to write the box blurb, they'd label it "slightly disappointing."